Installation of three phase electrical supply for commercial premises, large workshops, and high-demand domestic properties. Covers DNO application, main switch installation, and distribution.
Typical cost
£1,500 — £3,000
Typical duration
2-4 days
Certificate
Part P certified electrician required
Scope type
flexible
Typical tasks
Apply to DNO for three phase supply
Install main switch and distribution board
Run and connect three phase circuits
Test phase balance and protection
Issue certification and update DNO
Extras & additional works
Based on a standard residential installation with moderate access and typical circuit requirements. Costs may increase if additional circuits or complex configurations are needed.
Common questions Stainesai
Factors include the complexity of the installation, number of circuits, access difficulty, and regional labour costs.
Yes, this work is notifiable and requires Part P certification upon completion.
A typical installation takes 2-4 days, depending on the complexity and site conditions.
Three phase supply is often needed for properties with high power demands, such as those with large electrical appliances or machinery.
The installation includes applying to the DNO, installing the main switch and distribution board, connecting circuits, and issuing an Electrical Installation Certificate (EIC) for notifiable work. Always confirm with your electrician before work begins.
Ready to post a three phase supply installation job?
Describe what you need. Stainesai structures it into a proper scope. Your first job post is free.